Pbism eok hemogibbpiometebs



K. FUCHS.

PRISM FOR HEMOGL'OBINOMETERS. APPLlcATmN man MAY 19. 1921.

1,429,072, PatentedSept. 12, 1922.

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K. FUCHS.

PRISM FOR HEMOGLOBINOMETERS.

APPLICATION FlLED MAY 19, 1921.

i AQQY. Patented Sept 12, 1922. i 2 SHEETS-SHEET 2.

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INVINTO Patented Sept. 12, 1922.

UNITED STATES.

KARL FUCHS, or Arco, ivnwrnnsniz. f

PRISM 'ron HEMoGnoni'NoMnrEns. y

" i Applieatioii-luedlMay 19',

TO all/wimmelt may concern: f

g Be it'known that LKARL FUCHS,Y a citizen fof the United-States, residing at'k Atom-.inv the countyf'of Camden and State fof' New eters,l and has `forl its primary or `principal objectfto` improve the constructionfof such a prism whereby more uniform resultsare obtainable:

vide acrescent shaped prism of this character having-an arcuateori curved-line of sight which may be produced from a single piece of glass. l. y A further object of the invention isto provide a :new method of producingllor 'manu-4 facturing such a prism. f y i. v A still further object of the invention is f i to construct a prism* having a portion of one lof itsfacesbeveled or inclined in one direc#A i .tion andanother portion l'beveled' iii-another directionlto 'produce an'evenly graded andv accurately proportioned incline fromv one end consists in the details of' construction and' embodying my invention.

to the other of the lin'evofsight' thereby obtaining ally the advantages' of a straight prism in. one of angularfform.- f 1 yVith these ends in. view,l this'infvention combination of elements. hereinafter set forth and then specifically designated by the claims.

Inorder that those 1 stand how tomake and'use the same,f.lrv will describe its construction indetaih referring f by numerals to the accompanying drawings Fig. l, is a face globinometer test glass including a of this application, in

view Vof a complete hemo-y 'prism Figa is an edge Vlew thereof. Y

Fig. 3,1is a sectioiifattheline 3 3y of Fig. 5, is a face view of the'prism illus?? rst grinding operation.V

ig. l.

lFig. i1'. yf-FigylO, is section `at the line' 10-10'of Figi. f

Another object ofthe invention is to pro-L 15921, sereine. 470,867. l

:if a similar view showing the other position'at which it'is sety for the :second 'grindingl operation.'

Fig.v 8, isfa vrigrep Fig. ll, is a section at the line llv-llof Fig. il."

In carrying out my invention as here `emv section',l atfthe linee-e8 of is a section vat lthe liner 9 9 bodied, 2 'represents a disc of porcelain or '1 other similar Itranslucent substance which is partially cutv away or recessed to yreceive the ycrescent shaped prism 3 preferably vof ruby glass, said prismpbeing of one integralpiece 'secured in some suitablemanner to the recessed'poiftion of the disc the latter adapted to be rotatably mounted in a hemoglobinometer of present day construction.

)The prism decreases from the point 4 to approximately one-half its thickness at the vpoint 5 to a knife edge at the point Gland edge of the prismwhile' the secondary( prism decreases in thickness from tlie'poi'nt 4' to' the point 5 but the upper, lower or inner and outer faces of said secondary prism are peary d allel 't0 each other at'fany section through skilled in the' art to which this invention appertains, may yun'derf suitable object for use as a backing or holding means sothat the two points l and 6 are inv a' perpendicular `line represented by the primary p'rismpS toward the inner or convex numeral 10-whichis at right angles to a in Fig. 5. The positionof the prism glass relative to the perpendicular and 'base lines i is then such vthat when'ground on a line ioo parallel with the perpendicular line Which ywill give to the prism glass a beveled face prism during the grinding operation the inner or concaved edge Will be thinner than any-pointfon the outer edge-that is `on a line ,parallel *with the base line 11.

the perpendicular line so that a secondary secondary prism are of the `same thickness and lalthough said secondary prism decreasesv After. this first `grinding operation has lbeen completed `the .prism glass; ismoved; .untill they point 5 is on the opposite. side of@ tlieperpendicular line 10 and the .points 4. and 5 coincide with said perpendicular line. .The prism glass is then ground von an'incline away from the base line parallel with beveled face is produced decreasing in thickness from the poi-nt 4 to the point 5 .leaving the aforementioned line of demarcation 7 and 'along Which line both the primary and in thickness from the-point 4 to the point 5l in the same ratio as the primary .prism decreases in thickness from the point 5to the .point 6, anypoint on the convex or outer edge of .the prism between the points 4 and y5 on line With a point on the lineof demarcation parallel vvith the baseline IIWi-ll be in a horizontal plane or saidsecondary prism vrWill be of the same thickness `the entire length of said line. n v

. After the prism is formed yfrom the prism yglass by themethod herein describedy said prism isremoved from the backer or hold- /ing means an-d is then secured to the disc 2 -to produce a completed test glass as y shown in Fig. l wherein the arcuate lineor `circlesand dashes denoted by the reference` numeral 12 represents the line of sight and byreference to Figs. 7 and 8 it Willbe noted `that the dilferent points in the primary and secondary prisms have a gradual predetei-,

min-ed decrease in thickness along said line of, sight from the thick lto the thin end i of the prism an-d this same ratiooffdecreasing thicknessv is maintained in the secondary prism along of sight as plainly shown in Figs. 9, 10 and 11.

. I-Ieretofore it has been customary toproduce such prisms in tvvo or more pieces and up to the present time it has been practically impossible.toproduce a curved prism for hemoglobinoineters from a single piece of glassand although I had produced such `a glass assliovvn in my application Serial Number 387,389, dated June 8tli,`1920 'and of Wliichthis application-is a continuation,

I have found that the change in thickness of the prism from the point 4 to approxiof demarcation, the` primary. prism ldecrease in thickness "in that portion of the prism adjacent'the thicker 'end as that portion of the prism toward the thinner end. I have "overcome these disadvantages With the 'p prisml herein described by .producing the lsecondary prism on a different angle from that of theprimary prism so that said decrease in thickness throughout 'the secondary prismalong. itsjline of sight is of the same ratio as that of the primary prism along its line of sightland thereforethe rotation of theprism a givennumber of degrees in the line-of sight in either the 'rimary .or secondaryy prisms the lratio' of ecrease Vor increase Lvvill be identical.

Of course I do not Wish to be limited to lthe-exact details of construction 'as herein showin as these may be varied Within the 'limits of the-appended claims Without departing from the spirit ofmy invention.

Having thus Afully described. my.- invention, what I` claim as new and useful is l. A prism for hemoglob-inometers including a primary prism portion Vand .asecondary prism .portion separated by alineortion increasing in thickness froma kni'eedge toward said `line of demarcation l"and the secondary prism portion .increasingv in thickness in parallelism With saidline ,i of demarcation. 1.

2. A prism .for hemoglobinom'eters in- Soi cluding a primary 'prism portion and a` sec-Ak s londary prism'portion separated by a line vof demarcation,=the primary prism portion increasing `in Ithickness from 4aknife edge toW'ard said line of demaroationand 'along said l-line of demarcation,l the secondary prism portion increasing in thickness in parallelism With said line of demarcation, the opposite faces of the secondary prism portion, in any section ythereof at vright yanglles to theli-ne of demarcation, beingparalle v 3. A prism vfor hlemoglobinometers including ya primary prism portion anda secondary prism portion-separated by a line of demarcation, the secondary prism portion decreasing in thickness `from one end toward the other in parallelismvvith the line of demarcation, the primary prism portion decreasing in thickness along vsaid line of demarcationv the saine as the secondary prism portion and'from said lineof demarcation tovvard one side-and thel end of said primary prism portion. 4

4. A prism of the class mentioned includig .a primary prism `portion ,and a secondary.V

ing its line of decrease parallel with theline y of demarcation and the primary prism hav- `154529,072 I l W 8 ing-p its line of decrease at en angle to said kWith the `line of demarcation and the priline of demarcation. o y maryrism having its line of decrease at 5. A prism of the class mentioned inan an e of Inorethan orty-vedegrees to 10'` cluding a primary'prism portion and a secsaid line of demarcation. 5 ondary prism portion separated by a, line In testimony whereof, I- have hereunto of demaroation, the secondary prism por-` aiixed my signature. 0 v

tion having its line of decrease parallel? y n KARL FUCHS. o 

